diff --git a/core/assets/maps/serpulo/ruinousShores.msav b/core/assets/maps/serpulo/ruinousShores.msav
index 5b1a0dd1ec..a53e010bd7 100644
Binary files a/core/assets/maps/serpulo/ruinousShores.msav and b/core/assets/maps/serpulo/ruinousShores.msav differ
diff --git a/core/src/mindustry/content/SerpuloTechTree.java b/core/src/mindustry/content/SerpuloTechTree.java
index 2f08dc6b23..cd003c8fa4 100644
--- a/core/src/mindustry/content/SerpuloTechTree.java
+++ b/core/src/mindustry/content/SerpuloTechTree.java
@@ -528,7 +528,7 @@ public class SerpuloTechTree{
                                     });
 
                                     node(coastline, Seq.with(
-                                    new SectorComplete(windsweptIslands),
+                                    new SectorComplete(tarFields),
                                     new SectorComplete(saltFlats),
                                     new Research(navalFactory),
                                     new Research(payloadConveyor)